Which of Newton's laws best explains wa,8scwqkp 6 lrz;f m)2hy motorists should buckle-up?

  When you sit on a chair, the resulqgho,8x7uqs8 t36v+k4 xt*(uxl dii ptant force on you is

  In the absence of an external force, a moving obec3 2 ipb8tj8z0 mnvm8ject will

  When the rocket engines on the starship NO-PAIN-NO-GAIN are suddenlq+f0 /xkl3j7 cdd;s nqy turned off, while travelingn qql;+f dkc0/sxj7d 3 in empty space, the starship will

  A rocket moves through empty space in a straight line with con*nf;h-bohu 6 bnh.z 0ga29xzsstant speed. It is far from the gravitational .;0zg6a- bfhbxs 9nzhu2n*h oeffect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

  You are standing in a moving bus, facing forwa h3o1bb .zty*r*tnrsndi 9sap139. oo rd, and you suddenly fall forward. You can imply from this that thesbytr 1an.ptib o91 nozsr9 3o*3 .*dh bus's

  You are standing in a moving bus, facing forward, and you-egmmx d, rx+. suddenly fall forward as the bus comes to an immediate stop. + mmx x-gder., What force caused you to fall forward?

  A constant net force acts on an object. Describe the motion of 9gdgp3 / w47unl-e+xtg:n jsluc1m. xthe object.

  The acceleration of an object is inversely proportion8welb 407 oh,6asb )qjjpysrb wp2g 8)al to

  A net force F accelerates a mass m with ay;tczl o .hved :5/1ojn acceleration a. If the same net force is applied to mass 2m, then the acceleration wi;tcv o oh de1z.jy:l/5ll be

  A net force F acts on a mass m and produces an acceleration a. What acceleratiosu c 79x9y+hf 8 wdczfint+5ec,7ab(mn results if a net force 2i5,+(e9y w9 cufms7zfbc ac +8 hdt7xnF acts on mass 4m?

  If you blow up a balloon, and then release it, the balloon will r rwwue0;6tz9gmcnnko2.:v,hxkq 52 fly away. This is an illustration5kq wn2o;n t emrhvc rkx2z6.0ug,: 9w of

  Two cars collide head-on. At every)ms/dui f;a y*h,v: 6jhbf yc5 moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This isv uiy* af)/hm;ys h6fjcb, d:5 an example of

  If you exert a force F on an object, thl0-r2o rsuuitv) a hrqj)40 ,be force which the object exerts on you wi)0r j -aubq4s0rlut,v)ho2rill

  Action-reaction forces9,pvun*vdv )m8 pvcw)b,gqf/

  Action-reaction forck*47tgz5kxybk h 2- sees are

  A 20-ton truck collidesjvtyh cni sz.:v):si6 1/;blm with a 1500-lb car and causes a lot of damage to the car. Since a lot of damasbvns;:6vt)ilj .1 m:zi /hcyge is done on the car

  An object of mass m sits on a flat table. The Earth pulls on tp9 qbwra2e8jk p-8g5g his object with force mg, whi8ep-brg 2aw89pqk 5 gjch we will call the action force. What is the reaction force?

  A child's toy is suspe+i)i eqin1o7x nded from the ceiling by means of a string. The Earth pulls downward on the toy with its weight force qo)i71 +iinxe of 8.0 N. If this is the "action force," what is the "reaction force"?

  Your bat hits the ball pitched to you witha9x wdb5e e9nm0w9 jzv; :l+yw a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitud zw0a;eyejl9d v99:w w n+bm5xe is

State Newton's three tcf4 z-9wq u2rlaws.

  Mass and weight

  The acceleration due to gravity is loweg4 a6q( xkx*sqwv5ld-r on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Eart4v (-qgks w*6qxal5 dxh?

  An example of a force which ac b (cifwpg..u(ts at a distance is

  Who has a greater weight to mass ratio, a person w8 fr* m be7e);meren(yeighing 400 N or a person weighing 600 N?b*rf;8e)ee( m 7neymr

  A stone is thrown straight up. At the tophrb9 /1/ 75 f-exoy,ymenii 8izdv 1kb of its path, the net force acting on i5/y9f rehzb 1kb8iymd, 1n/7 -xvi eoit is

  A 20-N weight and a 5.0-N weight are dropped simultaneously from thelisg2dcca q w. sqry/-d2.) r5 same height. Ignore air resistance. .a-gi.)w s2cr 2c/dlrs5 ydqqCompare their accelerations.

  A brick and a feather fall tu av5h847j)kaga/nf c o the earth at their respective terminal velocities. Which object experiences the grea47a 85)fjcu v hkan/agter force of air friction?

  An object of mass m is hanging by a string from the ceilinai.v+oel8muvnrb i9i + )3rf(8gcsv 2g of an elevator. The elevator is moving up at constuaviclmv2r.fir+(s9 8n )v8i+3egb oant speed. What is the tension in the string?

  An object of mass m is hangingr 7l/ u mn(bycj8z5mb+ by a string from the ceiling of an elevator. The elevator is moving upward, but slowing down. What is th(8 ncm5y/7lzmrub+j be tension in the string?

  The force that keeps you from sliding on an icy sidewz7pa8q, 5jn.ypsz2xu)r /o bnalk is

  It's more difficult to start moving 9 y91 hjpld+l dn1fv/ tjhypk28o4*l va heavy carton from rest than it is to keep pushing it with constant velocity, becon v1t 9kdd+1l42y/hjj8fpv 9hplly*ause

  A horizontal force accelerates a box fromui9y+q(7y m1 bphke0i;l2sa d rest across a horizontal surface (friction yk7 a(2y10b+i;epiu9lqsmdh is present) at a constant rate. The experiment is repeated, and all conditions remain the same with the exception that the horizontal force is doubled. What happens to the box's acceleration?

  A packing crate slides down an inclined ramp atp+ urc4zb/ef-+ 8zn tt constant velocity. Thus we can zepu/+c4 f+nt8 brz-tdeduce that

  A block of mass M slides down a frictionless 4e*i -zmqoj ;fplane inclined at an angle q with the horizontal. The normal jm o e;*qz4f-ireaction force exerted by the plane on the block is

  A block of mass M slides down a frictionless plane iwi1rm6c qs u8mnn,39l nclined at an angle q with the horizontal. The normal reaction force exerted by the planec8n,qru96m3s1 wi lnm on the block is directed

  A block of mass M sl9z(ajjyl *b9il.cc-su hi4 1 zides down a frictionless plane inclined at an angle q with the horizontal. The gr.c(i b1ijll ch*jz 4asy9u-z9avitational force is directed

  Two toy cars (16 kg and 2.0 kg) lj+2 sme4ih x0 2ns-nware released simultaneously on an inclined plane that makwl -n0snxm2+4i2s j hees an angle of 30e with the horizontal. Make a statement which best describes their acceleration after being released.

  An object sits on a frictionless surface. A 16-N force is applied to the objeck/pk5x4 cagczus y: q03a9q-st, and it acceleratea uqx c459cksp / sz30q-:yakgs at $2.0 \; m/s^2$. What is the mass of the object?

  A sports car of mass 1000 kg can accelerate from rest to v6*bryi5 myn( 27 m/s in 7.0 s. What is the average forward force on th5 ni (m*rb6vyye car?

  Starting from rest, a 4.0-kg bodybk w xmrao-5-)mnt1la v /9k:b reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on themx-al kamn -rt5k )1:wob9b/v body?

  An antitank weapon fires a 3.00-kg rocket which acquiz -.kqp0jq6vv,2 oz (lko x1iv-2 aqvores a speed of 50.0 m/s aftev6x.qzizo2 jvv2k 0koq- q (-,vapo1lr traveling
90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?

  If you push a 4.0-kg mass wit, j dg1b.rqj6fh the same force that you push a 10-kg mass from restrdjf1 .qj6g,b,

  What is the mass of a person who weighs 110 ku. 36ir2eecue ) mq88j r8dgulb?

  What is the mass of an object that weighs 250 N on the surface of the Earth whexwbq q w/) xj-+9qu;ihre the acceleration due to +-u w b)9;jixqh xq/wqgravity is $9.80 \; m/s^2$?

  An object has a mass of 60 kg on the Earth. What is the mass of the object on t*0csw8ln x 7vmhe surface of the Moon where the acceleration due to gravity is only 1/6 of that on the Earth?lx0*cws v8m7 n

  Object A weighs 40 N on Earth, and object B weighs 40 N on the Moon. The Moowkat2 ikv2 la 6*qn /orn(p4i5n's gravity is one sixth of Earth/5lpaa6 nr(itq4*2onv 2i kw k's. Compare the masses of the objects.

  Sue and Sean are having a tug-of-war by pulling on opposite ends of a 5.0/fu+lhrei ja3yobf (,r7 4 4( znjvmp7-kg rope. Sue pulls with a 15-N force. Wh+ o anf7lzp,h(( yr j7j4b/vfe3muir4at is Sean's force if the rope accelerates toward Sue at $2.0 \; m/s^2$?

  A stack of books rests on a level frictionless surface. A force F acts on the slvx9d3i-rg n87i 2 aqjtack, an32 -7qj8vd ngxl raii9d it accelerates at $3.0 \; m/s^2$. A 1.0 kg book is then added to the stack. The same force is applied, and now the stack accelerates at $2.0 \; m/s^2$. What was the mass of the original stack?

  A person of weight 480 N stands on a scale in an yrr z1gpe636zxk*h9r elevator. What will the scale be reading when the ee1pgz*xr 6k9rz 3h y6rlevator is accelerating downward at $4.00 \; m/s^2$?

  A person on a scale rides in an elevator. If the mass *oxfnmfov1ns *w fj;de.;2/ ve9*kps of the person is 60.0 kg and the elevator accelerates doo mssvo v 9/1wff *n j*xfn2*p;ke.de;wnward with an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  A person on a scale rides p., yk7jp1jznin an elevator. If the mass of the person is 60.0 kg and the elevator accelerates upward w1ppyz nj,k7j. ith an acceleration of $4.90 \; m/s^2$, what is the reading on the scale?

  Two horizontal forces act on a 5.0-kg mass. One force has a magnitude dq mh(on3y5 wo x: ,t66conr4tof 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleratiow5h o4 o3tnycdr 6m6txo,q: (nn of the mass?

  An object of mass 6000 kg rests on the flatbed of a trvvk w;w jkr84w36*mdt 43psihipuu bxy(4:7auck. It is held in place by metal brackets that can exert a maximum horizontal fv6ws7riij h yau*w8v4x(4 k3 4m3k dpp:b;wutorce of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab?

  An object of mass 6000 kg rests on h steol;o2b //the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When2b/ shto o/el; the truck is traveling 15 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, whatk-/o (onvun3-.mot dx is the magnitude of the acceleration of the system? (.o vm/x 3nodnu -k-to(Ignore friction and the mass of the pulley.)

  In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 k7ihwgwq+;: m01uvkb8co.oq gg, what is the tension in the string? (Ignorebguoch7qv1wo .:g+q k;m0w 8i friction and the mass of the pulley.)

  A student pulls a box of books on a smooth horizontal +(+3: zriihfhpjxks zr kz6 ,2floor with a force of 100 N in a direction ( h6zxp zrkisf,3++rk 2j:zhi of $37^{\circ}$ above the horizontal. If the mass of the box and the books is 40.0 kg, what is the acceleration of the box?

  A student pulls a box of books on a smooth horizo.* iz6jmk3lj intal floor with a force of 100 N in a direction of 37.0e above the horizontal. If the mass of the bjij *6ik 3zl.mox and the books is 40.0 kg, what is the normal force on the box?

  A traffic light of weight 100 N qxpktwlwy4d u b ;s6jwe 1-9+-is supported by two ropes as shown in Fig. 4-2. What are the tensions in the r l+wwx4tjwd-p k ;6q9 -bsy1ueopes?

  In Fig. 4-2, if the tensions in the ropes a bwilm-3v.(z(pk tj:g m una/j7-l;enre 50 N, what is the mass of the traffic liz:-vm . 7nj/ba-l (emwujp3 (k;nltgight?

  Two boxes of masses m and 2my3 u xrijc5h8 y+i;2ob.pzq (v are in contact with each other on a frictionless surface. (See q (riy23ovu85y bcjpxh; z.i+Fig. 4-3.) What is the acceleration of the more massive box?

  Two boxes of masses m and 2m are in contact with each other on a frictionless si b56bz clae0b(sg+o.urface. (See Figc0alsoge+i(zb b 56 b.. 4-3.) What is the net force on the more massive box?

  Two boxes of masses m and 2m are connected 6pc cju82lzgvj4)oh7 by a rope. (See Fig. 4-4.) If the forward force on the more massive bjujoz4p7c28 lhvg) c6 ox is F, what is the tension in the connecting rope?

  Two boxes of masses m and 2m are connected by a rope. (See Fig. 4-4.) If th-se 4 x)s.xvz*5pnc kse forward force on the more massive box is F, what is the acceleration of the less massive 4 -cps5*xensvxzk s.)box?

Two boxes are connected by a cord running over a pulley as shown in Fixf marqrs3 xu64m ve07wp;g.h y+lw 3,g. 4-5. Boxrum6,gxe7x3v l;3 yq r.wpsf0w4hm+a I of mass
8.0 kg rest on the top of the table; the coefficient of kinetic friction between box I and the table is 0.10. Box II has a mass of 15.0 kg.
(a) Draw the free-body diagrams for the two boxes, identifying all of the forces acting on each of the masses.
(b) Calculate the acceleration of the system.
(c) Calculate the tension in the cord.

  The coefficient of static andzdgl:l -(ajq4k7g v8l kinetic frictions between a 3.0-kg box and a desk are 0.40 and 0.30, respectively. What is the net force on the box when a 15 N horizontal force is 7dz g:l4-k8 lqlj(vga applied to the box?

  The coefficients of static and kinetic frictions for plastic on 2 op 6;9cixbpcwood are 0.50 and 0.42coixc6 pp;9 b0,
respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest?

  An object slides on a level surface in the +x direction. It slows aoymodkike u:46: :wj6 nd comes to a stop with a :uk 6m4ei6wooy:k:j dconstant acceleration of -$2.45 \; m/s^2$. What is the coefficient of kinetic friction between the object and the floor?

  A 10-kg box sitting on a horizontal surface is pulled by a 5.0-N fo 9 fus7u.r,sbrrce. A 3.0-N friction fo,ur9 sb7sfr. urce retards the motion. What is the acceleration of the object?

  A horizontal force of 5.0 N accelerates a 4.)v,j a- mp z4fm:tkcp70-kg mass, from rest, at a rate of $0.50 \; m/s^2$ in the positive direction. What friction force acts on the mass?

  During a hockey game, a puck is given an initial speed of3ecj *b5xx bowp2)jw 6;owle)u sd:n9 10 m/s. It slides 50 m on the ice before it stops. What is the coefficient of kinetibbu;c )dp3)owe5jns:w9 e jw2 6*lxoxc friction between the puck and the ice?

  During the investigation of a traffic accident, police 9+ tykxw0ry-efind skid marks 90.0 m long. They determine the coefficientyxk -ywe0r+ 9t of friction between the car's tires and the roadway to be 0.500 for the prevailing conditions. Estimate the speed of the car when the brakes were applied.

  Two boxes of masses m and 3m are scfuy:s gny 3gf8-f3/htacked. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between the boxes is rough. If the less massive box /yf3s uy:c3-ffhggn 8 does not slide on the more massive box, what is the static friction force on the less massive box?

  Two boxes of masses m and 3m are stacke:ay erdybc s/do)5)3a d. (See Fig. 4-6.) The surface between the more massive box and the horizontal surface is smooth and the surface between thd)) ryac: /b ayo53dsee boxes is rough. If the less massive box does not slide on the more massive box, what is the coefficient of static friction between the boxes?

  An object is on a frictionless inclined plane. The plane is inclineo ue f.twk(0 lc)tw)d :b52oqnd at an angle tnwedl.w2)f(5 0q cboku) :toof $30^{\circ}$ with the horizontal. What is the object's acceleration?

  A 10-kg mass slides down a flat hillaua8 xd k9 il).k*sc8p that makes an angle of $10^{\circ}$ with the horizontal. If friction is negligible, what is the resultant force on the sled?

  A mass is placed on a smooth inclined plane with an angle,0tn zy j/q9d e-aeot: of $37^{\circ}$ to the horizontal. If the inclined plane is 5.0-m long, how long does it take for the mass to reach the bottom of the inclined plane after it is released from rest?

A block lies on a smooth incahp9 g.5 6mw5/aj/kd*wcupu z lined plane tilted at an angle of $35^{\circ}$ to the horizontal.
(a) Draw the free-body diagram for the block.
(b) Determine the block's acceleration as it slides down the inclined plane.
(c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline.
(d) How long did it take the block to reach the bottom of the inclined plane?

  A wooden block slides directly down an inclimh8,- l+l wgl q52okdlxu0cx- ned plane, at a constant velocity ofl2l8d+g-x h,c wokq 0-l x5mul 6.0 m/s.
What is the coefficient of kinetic friction, if the plane makes an angle of $25^{\circ}$ with the horizontal?

  An object with a mass m buf8 67 a9*sgkwux a.oslides down a rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. What is the acceleration of the object?

  An object with a mass m slides down2 d2cuk2r6czyr vsl4+ a rough $37^{\circ}$ inclined plane where the coefficient of kinetic friction is 0.20. If the plane is 10 m long and the mass starts from rest, what will be its speed at the bottom of the plane?

  A bulldozer drags a log weighing 500 N alot *fsb+w/ncibvue xm2 38a33hng a rough surface. The cable attached to the log makes an angleve bf bn3i/wm uahtc* 3+s2x38 of $30.0^{\circ}$ with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum tension is required in the cable in order for the log to begin to move?

A 25.0-kg box is released from rest on a rough inclined plane tilted at an angu( v90wark9ql le k0(ral uv9wq9 of $33.5^{\circ}$ to the horizontal. The coefficient of kinetic friction between the box and the inclined plane is 0.200.
(a) Draw the free-body diagram for the box.
(b) Determine the force of kinetic friction acting on the box.
(c) Determine the acceleration of the box as it slides down the inclined plane.

  An object is placed on an inclined plane. The angle of inclinemrm x;hf,bc40wtzv,:k,yd/i is gradually increased until the object begins to slide. ym:b/, cw;mdxfitvh0,z,r 4k The angle at which this occurs is q. What is the coefficient of static friction between the object and the plane?